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C. trapezoid. D. isosceles trapezoid. The shape above has exactly one pair of parallel sides, so you can rule out parallelogram and kite as possible classifications. The shape is definitely a trapezoid because of the one pair of parallel sides. For a shape to be an isosceles trapezoid, the other sides must be congruent.
Types of Quadrilaterals--Parallelograms. If a quadrilateral has two pairs of parallel opposite sides, then it is called a parallelogram. Parallel sides in a parallelogram are also congruent in length. In addition, because opposite sides are parallel, opposite angles are congruent as well. An example of a parallelogram, with congruent parts identified, is shown below. As with the trapezoid, we can derive a formula for the area of a parallelogram by dividing it into a rectangle and two triangles.